Here is an awesome assembler called DASM. It was written by Matt Dillon for the Amiga, and I modified it to compile for MS-DOS. I received permission from Matt to put this modified version here. (Thanks Matt!)
- MS-DOS version of Dasm version 2.02 - works on 16-bit machines.
- MS-DOS version of Dasm version 2.12 - works on 32-bit machines - needed to compile Solaris.